int select_atacker( const Banda *const b ) {
    int pula = 3;
    for( int i=0 ; i<CNT_POSTACI ; i++ ) {
        const Postac *const p = b->postaci + i;
        if( p->live > 0 )
            pula += p->evil * (p->spirit + p->strength);
    }

    for( int i=2 ; 1 ; i++ ) {
        const Postac *const p = b->postaci + i%CNT_POSTACI;
        if( p->live > 0 )
            if( p->evil * (p->spirit + p->strength) > my_rand()%pula )
                return i;
    }

}